JPH09163530A - Gas insulating switch apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent temperature rising and to achieve the low cost and the compact configuration by providing a cooling fan, wherein permanent magnets are assembled in a container, and rotating the fan by the action with the magnetic flux caused by an AC flowing through a connected conductor in the container. SOLUTION: In the inside of a fan 3b, a semicylindrical S-pole permanent magnet 3e and an N-pole permanent magnet 3f are embedded in the facing pattern. A vane part 3d is provided around the outer surface of a main body part 3c. When an AC (i) is made to P flow through a connected conductor 2, an AC magnetic flux 5 is generated. When the magnetic flux is interlinked with the permanent magnets of the S pole and the N pole, the fan 3b is rotated by the interlinking. Thus, the insulating gas in a container 1 is heated by the heating of the container 1 and the connected conductor 2. when the high- temperature insulating gas is collected at the upper part, the temperature in the container 1 is averaged by the rotation of the cooling fan 3, and the temperature rising can be prevented. Furthermore, the container 1 can be made compact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switchgear installed in a power plant or a substation.

[0002]

2. Description of the Related Art FIG. 6 is a longitudinal sectional view of a part of a conventional gas-insulated switchgear, in which a container 1 is filled with an insulating gas, and a connecting conductor 2 is arranged inside. Has been done. The gas-insulated switchgear has a structure in which containers are connected, and there is also a part that accommodates various switchgear.

[0003]

In the conventional gas-insulated switchgear described above, when energized, heat is generated due to the resistance of the connecting conductor 2, the high-temperature insulating gas 4 is accumulated in the upper part of the container 1, and the low-temperature insulating gas is in the lower part. Gas accumulates. Therefore, the temperature difference between the upper and lower insulating gases becomes larger as the container becomes longer vertically.

In the power switchgear, the standard (JE
The temperature rise value is determined by the surface treatment method of the inner conductor and the part of the container according to C), and the gas insulation switchgear must meet such standard values. Various measures are taken to prevent temperature rise due to differences. First, the connection conductor 2
Or the material of the connection conductor 2 was changed from Al to Cu to reduce the electrical resistance and reduce the amount of heat generation. Further, if the container 1 is made of iron, an eddy current is generated by the magnetic flux due to the current i flowing through the connection conductor 2 and heat is also generated. Therefore, the container 1 is made of a non-magnetic material such as stainless steel or aluminum to prevent heat generation due to the eddy current. Was. Further, in order to improve the heat dissipation efficiency of the heat generated by the connection conductor 2, the shape of the container 1 is complicated and the surface area thereof is increased.

However, any of the above measures for preventing the temperature rise leads to an increase in cost, and the container 1
Has also become larger.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a gas-insulated switchgear capable of preventing temperature rise and being inexpensive and compact.

[0007]

A gas-insulated switchgear according to the present invention is provided with a cooling fan in which a permanent magnet is incorporated in a container, and the cooling fan operates by a magnetic flux generated by an alternating current flowing through a connecting conductor in the container. It is designed to rotate.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1A and 1B are a vertical cross-sectional view of a part of a gas-insulated switchgear according to Embodiment 1 and an enlarged vertical cross-sectional view of a cooling fan thereof, and 3 is attached to the lower surface of an upper lid 1a in a container 1. It is a cooling fan, and its fixed shaft 3a has an upper lid 1a.
Is fixed to the lower surface of the fan, and a fan 3b is rotatably supported on the fixed shaft 3a. The cylindrical body portion 3c of the fan 3b
Is formed of a non-magnetic material (including an insulating material), in which a semi-cylindrical S-pole permanent magnet 3e and a semi-cylindrical N-pole permanent magnet 3f are embedded so as to face each other. A blade portion 3d is provided on the outer periphery of the portion 3c. FIG. 2 shows only the permanent magnets 3e and 3f.

In the above structure, when an AC current i is passed through the connecting conductor 2, an AC magnetic flux 5 is generated, and the AC magnetic flux 5 is linked with the permanent magnets 3e and 3f of the S pole and the N pole to rotate the fan 3b. To do. Therefore, when the insulating gas in the container 1 is heated by the heat generation of the container 1 and the connecting conductor 2 and the high temperature insulating gas is accumulated in the upper part, the cooling fan 3 is rotated to separate the high temperature gas in the upper part and the low temperature gas in the lower part. The temperature is lowered below a predetermined value by stirring and averaging the temperature.

In the first embodiment, the temperature inside the container 1 is averaged by the rotation of the cooling fan 3 to prevent the temperature rise. Therefore, the diameter of the connection conductor 2 can be reduced, and the material thereof can be aluminum.
The inexpensive connecting conductor 2 can be used. Further, the container 1 can be made of iron, which is inexpensive. Further, since it is not necessary to increase the surface area of the container 1 and the connecting conductor 2 having a small diameter can be used as described above, the container 1 can be downsized.

Further, since the cooling fan 3 is driven by the magnetic flux generated by the current flowing through the connection conductor 2, the motor is not required outside the container 1 and the cost can be reduced. In addition, a hole is opened in the container 1 for connecting the motor and the cooling fan 3,
Since it is not necessary to give airtightness to this hole, reliability of airtightness can be improved. Further, when the energizing current of the connection conductor 2 increases, the amount of heat generated increases, but the driving force of the cooling fan 3 also increases and the stirring force also increases, so there is no problem.

Embodiment 2 FIG. 3 shows permanent magnets 3e and 3f embedded in a fan 3b of a cooling fan 3 in a gas-insulated switchgear according to Embodiment 2.
FIG. 3 is a perspective view showing a state in which 1/4 cylindrical S-pole permanent magnets 3e and 1/4 cylindrical N-pole permanent magnets 3f are alternately combined to form a cylindrical shape as a whole. And has a four-pole structure. The effect is the same as that of the first embodiment.

Embodiment 3 FIGS. 4 (a) and 4 (b) are sectional views of a cooling fan 3 of a gas-insulated switchgear according to Embodiment 3, and a rod-shaped S-pole permanent magnet 3g embedded in the fan 3b and a rod-shaped permanent magnet. N-pole permanent magnet 3
A perspective view in which h is taken out is shown, and a pair of rod-shaped permanent magnets 3g and 3h are arranged to face each other, and the operation and effect are the same as in the first embodiment.

Embodiment 4 FIG. 5 is a fan 3b of a gas insulated switchgear according to Embodiment 4.
FIG. 3 is a perspective view showing two pairs of rod-shaped permanent magnets 3g and 3h embedded in the structure, in which one ends of the permanent magnets 3g and 3h are arranged so as to face each other, and a four-pole structure is formed. Is the same as in the first embodiment.

[0015]

As described above, according to the present invention, the cooling fan in which the permanent magnet is incorporated is provided in the container, and the cooling fan is driven by the magnetic flux of the alternating current flowing through the connection conductor. The fan can stir the insulating gas in the container to prevent its temperature rise.
In addition, it is possible to use an inexpensive container or connecting conductor,
Cost reduction becomes possible. Further, since the diameter of the connecting conductor can be reduced and the container can be downsized, the overall size can be reduced. Further, the cooling fan does not require a special drive source, and is also small and inexpensive.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a part of a gas-insulated switchgear according to Embodiment 1 of the present invention and an enlarged sectional view of a cooling fan thereof.

2 is a perspective view of a permanent magnet used in the gas-insulated switchgear according to Embodiment 1. FIG.

FIG. 3 is a perspective view of a permanent magnet used in a gas-insulated switchgear according to a second embodiment.

FIG. 4 is a vertical sectional view of a cooling fan of a gas insulated switchgear according to a third embodiment and a perspective view of a permanent magnet thereof.

FIG. 5 is a perspective view of a permanent magnet used in a gas insulated switchgear according to a fourth embodiment.

FIG. 6 is a vertical cross-sectional view of a part of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Container 2 ... Connection conductor 3 ... Cooling fan 3b ... Fan 3c ... Main body part 3d ... Blade part 3e-3h ... Permanent magnet

Claims (1)

[Claims] 1. A gas-insulated switchgear in which a connecting conductor is provided in a container and an insulating gas is sealed, a permanent magnet is incorporated, and a cooling fan that rotates by the action of a magnetic flux generated by an alternating current flowing in the connecting conductor is provided in the container. A gas insulated switchgear characterized by being provided.